Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Ideal gas specific heat calculation

  1. Jan 21, 2012 #1
    1. The problem statement, all variables and given/known data

    See attachment "problem".

    2. Relevant equations
    See attachment "data"

    3. The attempt at a solution

    Can someone tell me what values to plug in for the equation R/M integral (a+bT+cT^2...). The solution doesn't show this step, so I have no idea the numbers they used to get to 516.9 kJ/kg.

    I know M is the molecular mass (44g), don't know R (universal gas constant, there are several), and as to the a+bT+cT^2+dT^3 from table D11 I plug in the values of a, b, c, and d for CO2, plug in 800K and 300K and do the integral and get something to the 19th power...which obviously is wrong. Any help would be appreciated. Thanks.

    Attached Files:

  2. jcsd
  3. Jan 22, 2012 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    I'll bet you're reading the data wrong in ther table.

    For example, d = 2.002 x 10-9, not 2.002 x 109.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook